The 23-year-old became Sunderland's club record signing when he joined from French side Lorient for £13m in 2016, but has been linked with a move away this month.

And the Daily Mail is reporting that the Gabon international is of interest to Watford, with the Hornets reported to have made an enquiry about the possibility of signing Ndong on loan, with a view to a permanent move.

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It is understood that Sunderland will be willing to listen to offers for Ndong, and the Mail is reporting that Watford could firm up their interest with a bid to try and complete a move before the transfer window shuts.